darcs patch: CmmOpt cannot assume single assignment for hand-writte...

[Edward Z. Yang]

This is a kind of curious patch that I want to chat with Marlow about.
Basically, I believe that CmmOpt is making an assumption about the
incoming Cmm that doesn't necessarily hold, though it doesn't seem like
it's been a problem in practice.

1 patch for repository http://darcs.haskell.org/ghc:

Thu Mar 31 16:56:20 BST 2011  Edward Z. Yang <ezyang at mit.edu>
  * CmmOpt cannot assume single assignment for hand-written or new codegen Cmm.
  
  This change may constitute a substantial performance hit.  We should
  check this, and also see if we can convert hand-written Cmm to single
  assignment, and then use the old code w/o running the optimizer on
  the new code generator output.

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